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w. M, WATSON MakingPlow Irons. No. 100,825. Patented March 15, 1870.

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wgMQWArsoN or T0N1eA;rLLINoIs Letters Patent No. 100,825, dated March15, 18751 MAKING- DOUBLE- S HINNED MOLD-BOARD BLANKS FOR FLOWS.

The Schedule referred to these Letters Patent and making part of thename Be: it known that I, W. M. WATSON, of the town of-Toniea, in thecounty of La Salle, and State of Illinois, have invented a new anduseful Improved Mode of Making Mold Board Blanks for Plows DoubleSkinned; and I do hereby declare that the following is a full and exactdescription thereof, reference being hadso the accompanying drawings andto the letters of reference marked thereon.

The natureof my invention consists in providing'a form, mold, or swagein which the shin ofthe moldboard blank canQbe upset, to any desiredthickness.

The general way of making the shin of the mold board double thethickness of the mold-board'is to weld a strip of steel on the under,side.

-tion to it is, that it is -impossible always to make the The objecweldsolid. There will he sometimes blisters in the eenter of the weld, and,when the mold-board is worn through to the weld,-wil1 prevent the-plowfrom scourthan a single-shinued plow.

My object is to form the shin double, and know every time that it issolid.

To enable others skilled in the a'rtto make and use my invention, I willproceed to describe itseonst-ruction. and operation. I t

The mold-board blankis cut out in any of the ordi nary ways, andin anyshape required; the only difing andotherwise working well, and will lastno longer ference I make is 'in cutting the blank longer at the shin, toallow enough steel to upset it to the required thickness, as seen atfig. 2, it.

Figure 1 is a sectional view out through the center of the form. t t

Figure 2is a top view of the same.

The'form is made in two parts, a and b, and hung ona hinge, h, andfastened with clamps d, for the greater convenience of placing in andtaking out the mold-board after it is formed'i'n proper shape.

' The front side of a is made plain, and that of b is made so as to formthe double shin of any thickness and shape required, as shown by theshaded lines at c.

a is made to extend above b, 'as shown at f, either by being cast solidor put on with dowel-pins e, the object being to guide the steelwhilebeing upset, and prevent it from doubling over,

By using a form in two parts, when another pattern of plow is required,it is only necessary to take ofi' one-half of the form and replace withthe shape required, thus saving one-half the expense of forms.

I usually make the form of cast-iron, but it can be made of any suitablemetal, and the form may be made in various ways, as will readily suggestitself to persons skilled in working in iron.

. .The mold-board blank is heated to a proper heat, placed in theform,put under a light trip-hammer,

and upset until the proper thickness is obtained and the steel hammeredsolid in the form; a lever, screw, rolls, or hand-labormay be used,.buta trip-hammer does the work the best. t

a What I claim as my invention, and desire to secure by Letters Patent,is

